T11627a fails sometimes on CI

See this build - https://gitlab.haskell.org/mpickering/ghc/-/jobs/6459

Causes this panic

81384 cd "profiling/should_run/T11627b.run" && ./T11627b +RTS -hd -RTS +RTS -i0 -RTS  
81385 Wrong exit code for T11627a(prof_hc_hb)(expected 0 , actual 134 )               
81386 Stdout ( T11627a ):                                                             
81387 456574                                                                          
81388 Stderr ( T11627a ):                                                             
81389 T11627a: internal error: LDV_recordDead: Failed to find counter for closure 0x42000bf558
81390     (GHC version 8.7.20181227 for x86_64_unknown_linux)                         
81391     Please report this as a GHC bug:  https://www.haskell.org/ghc/reportabug

Trac metadata

Trac field	Value
Version	8.6.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
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